Changeset 4785:60919d1fa9af in roaraudio

Timestamp:

03/11/11 01:43:46 (13 years ago)

Author:

phi

Branch:

default

Phase:

public

Message:

added roar_random_uint{16,32}()

Files:

• include/libroar/random.h (modified) (1 diff)
• libroar/random.c (modified) (2 diffs)

include/libroar/random.h

@@ -52 +52 @@
 int roar_random_salt_nonce (void * salt, size_t len);
 
+uint16_t roar_random_uint16(void);
+uint32_t roar_random_uint32(void);
+
 int roar_random_gen(void * buffer, size_t len, int quality);
 

libroar/random.c

@@ -57 +57 @@
 static size_t roar_nonce_salt_len = 0;
 static void * roar_nonce_salt     = NULL;
+
+static unsigned char roar_nonce_pool[TIGER_DIGESTLEN];
+static size_t        roar_nonce_pool_len = 0;
 
 int roar_random_gen_nonce(void * buffer, size_t len) {
@@ -138 +141 @@
 }
 
+uint16_t roar_random_uint16(void) {
+ uint16_t ret;
+
+ if ( roar_nonce_pool_len < 2 ) {
+  roar_random_gen_nonce(roar_nonce_pool, sizeof(roar_nonce_pool));
+  roar_nonce_pool_len = sizeof(roar_nonce_pool);
+ }
+
+ ret  = roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+0] <<  0;
+ ret |= roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+1] <<  8;
+
+ roar_nonce_pool_len -= 2;
+
+ return ret;
+}
+
+uint32_t roar_random_uint32(void) {
+ uint32_t ret;
+
+ if ( roar_nonce_pool_len < 4 ) {
+  roar_random_gen_nonce(roar_nonce_pool, sizeof(roar_nonce_pool));
+  roar_nonce_pool_len = sizeof(roar_nonce_pool);
+ }
+
+ ret  = roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+0] <<  0;
+ ret |= roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+1] <<  8;
+ ret |= roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+2] << 16;
+ ret |= roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+3] << 24;
+
+ roar_nonce_pool_len -= 4;
+
+ return ret;
+}
+
 int roar_random_gen(void * buffer, size_t len, int quality) {
  if ( len == 0 )